Re: [Xen-devel] [PATCH for-4.10 1/2] tools/libxc: Fix precopy_policy() to not pass a structure by value

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Oct 13, 2017 at 06:32:18PM +0100, Andrew Cooper wrote:
> c/s 4d69b3495 "Introduce migration precopy policy" uses bogus reasoning to
> justify passing precopy_stats by value.
> 
> Under no circumstances can the precopy callback ever be executing in a
> separate address space.
> 

The callback is not executed in a separate address space. 

Have you checked
<1506365735-133776-4-git-send-email-Jennifer.Herbert@xxxxxxxxxx>?

The open source toolstack spawns another process to save vm image. In
order to let libxl control the process (in the future) there is
information passed across process boundary.

Your code might work for now because Joshua's patch is not yet applied.

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